Forming device for the production of a sanitary tub designed as a cast foam component, method for the production of such a sanitary tub and sanitary tub

Abstract

Forming device for the production of a sanitary bathtub designed as a cast foam component, method for the production of such a sanitary bathtub and sanitary bathtub. The present invention relates to a forming device for manufacturing a sanitary bathtub designed as a three-dimensionally shaped cast foam component, with a cavity forming a negative mold of the sanitary bathtub, comprising a plurality of forming parts that can be connected to one another for closing the forming device and that, in a connected state, form the cavity. The present invention further relates to a method for manufacturing such a sanitary bathtub and to a sanitary bathtub itself.

Description

AREA OF INVENTION

[0001] The present invention relates to a forming device for producing a three-dimensionally shaped sanitary bathtub designed as a cast foam component, a method for producing such a sanitary bathtub, and a sanitary bathtub produced by the method. TECHNICAL BACKGROUND

[0002] Sanitary tubs, in their various forms as bathtubs, shower trays, or washbasins, are an integral part of bathrooms. They are also used in medical facilities, rehabilitation centers, and spas, as well as in health resorts, thermal baths, and spas. Furthermore, sanitary tubs are used in the wellness and hotel industry, and in private homes as whirlpools or tubs equipped with massage jets, in a variety of designs, shapes, and sizes. Besides sanitary tubs with bodies made of ceramic, porcelain, plastic, or metal, there are also those with bodies made of molded foam that have a stabilizing and sealing outer layer. The body of such sanitary tubs is milled and cut, either entirely or partially, from a solid block of material and then covered with the outer layer.In addition to the complex and time-consuming manufacturing process, the high amount of waste material during the processing of the block material also proves to be a disadvantage.

[0003] This is a situation that needs improvement. SUMMARY OF THE INVENTION

[0004] Against this background, the present invention aims to create a device and a method for manufacturing a sanitary bathtub designed as a cast foam component with reduced time and material expenditure.

[0005] According to the invention, this problem is solved by a forming device with the features of claim 1, by a method with the features of claim 8 and / or by a sanitary tub with the features of claim 16.

[0006] The solution according to the invention provides a forming device for producing a sanitary bathtub designed as a three-dimensionally shaped cast foam component, with a cavity forming a negative mold of the sanitary bathtub. The forming device comprises a plurality of forming parts that can be connected to one another to close the forming device and that, in a connected state, form the cavity.

[0007] Furthermore, the solution according to the invention provides a method for manufacturing a sanitary bathtub designed as a cast foam component in a molding device according to the invention. The method comprises providing the molding parts in an unconnected state; applying a release agent to the inner surfaces of the molding parts that define the cavity; applying a first coating agent to the inner surfaces and curing the first coating agent; applying a second coating agent, superimposed on the first, to the inner surfaces and curing the second coating agent; closing the molding device by pivoting or folding the molding parts to form the cavity; filling the cavity with a flowable cast foam; and demolding the sanitary bathtub designed as a cast foam component after the cast foam has cured.

[0008] Furthermore, the solution according to the invention provides for a sanitary bathtub manufactured using the inventive method. The sanitary bathtub has a tub body with a multi-layered structure and comprises an inner tub core formed from a casting foam, a first layer enclosing the tub core, in particular formed from a polyurethane soft coating material, and a second layer applied to the first layer, in particular formed from an elastic polyurethane lacquer. A sanitary bathtub within the meaning of the invention fundamentally refers to tubs, tub-shaped or tub-like vessels, basins, or the like for use in a sanitary area, which, among other things, have an open, larger, deeper, and possibly elongated vessel, in particular for bathing, showering, or washing.A sanitary tub within the meaning of the invention therefore comprises in particular bathtubs, shower trays, whirlpools, foot baths, arm baths, sitz baths, medical and geriatric bathtubs, obstetric bathtubs, washbasins, etc. It also primarily includes permanently installed basins or tubs used in the kitchen area, for example as sinks or basins.

[0009] The underlying idea of ​​the present invention is to dimension the cavity in a closable and openable molding device such that its volume corresponds to the volume of the finished cast foam component and enables the formation of the multi-layered structure of the cast foam component in a single device. The layered structure can be created in the device starting from the inner layering of the cast foam component. The build-up thus proceeds from the outside, i.e., from the coating, inwards, i.e., towards the last foamed tub core added.The multi-part design of the molding device simplifies the application of the outer layers of the cast foam component to the molding parts when the device is open. Connecting the already coated molding parts to close the device creates the cavity that forms the negative mold for the cast foam component. This cavity can then be easily filled with the cast foam to complete the cast foam component, i.e., the bathtub body in the case of a sanitary bathtub. The coating forms the stabilizing outer shell or casing of the cast foam component, which simply needs to be filled with the foam material. A further advantage is the stable and tight bond between the coating and the foamed filling material resulting from the manufacturing process.After demolding, a molded foam component, in particular a sanitary bathtub, is provided, which already has all coatings applied to the base body formed from a foamed and cured foam material. Due to the coating structure, it possesses high component stability despite its low weight. The molding device enables the production of sanitary bathtubs made from molded foam components with reduced material and time expenditure, as the time-consuming and material-wasting processing of a solid block of material followed by coating application is eliminated. The molding device also expands the design possibilities for the respective molded foam component by allowing for appropriate adjustments to the mold parts in terms of size, geometry, and the selection and color of the coating material.

[0010] Advantageous designs and further developments result from the further sub-claims as well as from the description with reference to the figures in the drawing.

[0011] According to a further development, the forming components are pivotally or hingedly connected to one another in the open state of the forming device by means of hinges, particularly those located at adjacent outer edges. The hinges advantageously simplify the transition from the open to the closed state of the forming device by guiding the forming components. The pivoting or hinged connection enables precise and repeatable closing of the forming device. This simplifies the production process and reduces the time required for assembly. The use of hinges ensures that the forming components are assembled precisely in the intended position during each production cycle. The pivoting or hinged mechanism facilitates access to the inner surfaces of the forming components in the open state, i.e., when the forming device is open.This enables a uniform and controlled application of the coating materials to the cavity boundaries, ensuring that the layers are applied cleanly and without interruption. Since the hinges efficiently connect the mold components and close the molding device, the entire manufacturing process is accelerated. At the same time, they minimize the need for additional components such as clamps or fasteners. The pivoting or hinged connection also allows for easy adjustment of the mold components, enabling the production of various sizes and geometries for the molded foam sanitary tubs. This significantly expands the device's range of applications, particularly with regard to custom or complex shapes.The ability to close the molded parts quickly and precisely reduces the space requirements and complexity of the production lines and increases the efficiency in carrying out the work steps.

[0012] According to further training, the mold components feature corresponding receptacles for fasteners, particularly pins or screws, which can be positioned when connected. This advantageously ensures precise positioning of the mold components relative to each other and simultaneously minimizes inaccuracies in fit. The use of pins or screws creates a stable mechanical connection between the mold components. This prevents unintentional shifting or slippage of the parts during the manufacturing process, especially when pouring the casting foam. This stability directly impacts the quality and dimensional accuracy of the manufactured sanitary tub or the casting foam component forming it. The use of standardized fasteners such as pins or screws facilitates the repeated joining and disassembly of the mold components.This is particularly advantageous in series production, as the connection can be made and broken quickly and reliably. Furthermore, the corresponding receptacles and fixed connecting elements help to keep the cavity sealed in the connected state and prevent the escape of casting foam.

[0013] According to an alternative development method, the molded parts feature corresponding interlocking plug-in, snap-in, or clamping elements on their outer surfaces facing away from the cavity. The use of these plug-in, snap-in, or clamping elements significantly accelerates the joining process. Compared to traditional joining methods such as screws or pins, no additional tools are required. This saves time and increases efficiency, especially in mass production. The interlocking fasteners enable tool-free joining of the molded parts. This simplifies handling for the operator and streamlines the manufacturing process. The plug-in, snap-in, or clamping elements ensure a secure mechanical connection of the molded parts when joined.This advantageously ensures a stable cavity that withstands the stresses during the filling and curing of the casting foam without the molding parts shifting.

[0014] According to a further development, the cavity has a filling opening that is open when the mold components are joined, but can be closed by a separate mold component. The open filling opening advantageously allows for easy filling of the flowable casting foam material. The separate mold component serves to securely and tightly seal the cavity after filling, thus ensuring a controlled foaming process. A further advantage is that any air trapped during filling can easily escape through the open filling opening, reducing the risk of air inclusions in the foamed mold component.

[0015] The separate molding element can be attached at any time, allowing for optimal control of the foaming process. This enables adaptation to different geometries or sizes of the mold components. Since the separate molding element seals the cavity, it also contributes to the mechanical stability of the molding device, particularly during the curing of the foam material. This is especially advantageous when high filling pressures occur. The separate molding element can be easily replaced or adapted to different geometries of the filling opening. This increases the flexibility of the device and allows for adaptation to various production requirements. Furthermore, the separate molding element can be used to form a finishing surface or base onto or off the cast foam component or sanitary tray.

[0016] According to a further development process, vent channels for the cavity are molded into the mold components. These integrated vent channels advantageously allow for the controlled escape of trapped air during the filling of the cavity with the flowable casting foam. This prevents the formation of air pockets that could impair the homogeneity and mechanical stability of the manufactured cast foam component. The vent channels also contribute to a more uniform distribution of the casting foam material within the cavity. The controlled removal of air during the expansion of the foam material makes the foaming process more efficient, resulting in improved dimensional accuracy and surface quality of the sanitary bathtub or cast foam component.Integrating the venting channels directly into the mold components eliminates the need for separate venting devices and significantly reduces the complexity of the fixture. A further advantage is that the venting channels ensure controlled pressure relief during the filling and curing process, thus reducing the risk of the mold components being damaged by excessive internal pressure or the cavity becoming leaky.

[0017] According to further training, at least one accessory component of the finished sanitary bathtub (made of cast foam) and / or at least one placeholder for a subsequently installed accessory can be integrated into the molded parts. The ability to integrate accessories such as drains, water inlets, nozzles, or other functional elements directly into the molded parts advantageously reduces the effort required for the subsequent assembly of these components. This makes the production process more efficient and cost-effective. Placeholders in the molded parts, on the other hand, ensure precise and reproducible positioning of the accessories within the sanitary bathtub or cast foam component and advantageously improve the functionality and aesthetics of the final product, particularly in the case of sanitary bathtubs with complex geometries.The use of accessories or placeholders during the manufacturing process eliminates the need for subsequent work such as drilling, milling, or other modifications to the finished component. The ability to use placeholders for accessories to be installed later also allows for greater flexibility in the design of the mold and the final product. This makes it easier to implement different configurations for various applications. Integrating accessories or placeholders during the foaming process advantageously ensures a seamless bond between these components and the foamed material. This improves the tightness and stability of the finished cast foam component, particularly in the case of sanitary bathtubs exposed to high loads or moisture.In series production, this further training enables a standardized and automated integration of accessories or placeholders, thereby advantageously increasing production capacity and reducing the error rate.

[0018] In a further development of the inventive method, after the closing of the forming device, the forming components are fixed by inserting the connecting elements and / or closing the interlocking plug-in, snap-in, or clamping elements. Fixing the forming components after closing the forming device advantageously ensures a stable and secure connection and prevents slippage or unintentional movement of the forming components during filling the cavity and curing of the casting foam. Fixing the forming components maintains the forming device in its intended geometry, so that the cavity precisely replicates the desired shape of the casting foam component. This contributes to high repeatability in production.The option of using fasteners such as pins or screws and / or locking, snap-in, or clamping devices allows for flexible adaptation to different production requirements. This is particularly advantageous when the device is to be used for various cast foam components. Securing the mold components helps to ensure the cavity is airtight and prevents liquid casting foam from escaping during filling. The combination of closing the mold and then fixing it in place ensures intuitive and efficient handling, especially in series production.

[0019] According to a further development of the inventive method, after the cavity has been formed, the joints of the molded parts within the cavity are coated with the first and / or second coating agent. This additional coating of the joints within the cavity ensures a seamless coating, prevents the penetration of casting foam into gaps or unwanted areas, and contributes to a high degree of cavity sealing. The post-processing of joints within the cavity advantageously ensures that the inner surfaces of the cavity have a smooth and uniform coating. This increases the quality of the outer surfaces of the manufactured sanitary tub made of cast foam and reduces the need for rework on the final product.

[0020] According to a further development of the inventive method, after filling the cavity with a flowable casting foam, the cavity's filling opening is closed with a separate molding element. Closing the filling opening with the separate molding element advantageously prevents the flowable casting foam from escaping the cavity. This reduces material loss and ensures efficient use of the foam material. Furthermore, closing the filling opening completely seals the cavity, thereby maintaining a uniform internal pressure during the curing of the foam material. This contributes to the dimensional accuracy and shape retention of the manufactured cast foam component. A further advantage is that closing the filling opening ensures controlled and homogeneous expansion of the foam material within the cavity and smooths the foaming process.

[0021] According to a further development of the inventive method, the first and / or second coating material is applied using a hot spraying process. The use of a hot spraying process advantageously achieves a uniform distribution of the coating material on the inner surfaces of the cavity, thereby improving the surface quality of the finished component. Heating the coating material during the hot spraying process reduces its viscosity and improves its flow behavior. This results in a uniform surface structure and improved adhesion of the coating materials. The hot spraying process also advantageously accelerates the chemical reaction processes of the coating materials, thus reducing production times. Furthermore, the hot spraying process can be adapted to different material properties by controlling the temperature and spray parameters.A hot spray process within the meaning of the present invention is understood to be a deposition process in which coating materials, for example polyurethane lacquers or polyurethane soft coating materials, are heated in a reactor to the required processing temperature (typically 60-90 °C). The heated material is then applied to the inner surfaces of the cavity via a nozzle under high pressure in a finely atomized spray jet. Polyurethane lacquers, for example, are applied as a thin, particularly and depending on the application, between 1 mm and 10 mm thick, especially between 2 mm and 5 mm, preferably 3 mm thick, elastic protective and top layer that cures quickly and forms a robust, smooth surface. Polyurethane soft coating materials, on the other hand, are applied in thicker layers to create a flexible, shock-absorbing, and insulating layer.The process advantageously ensures efficient coating with a uniform, defined layer thickness and high adhesion of the coating materials.

[0022] According to a further development of the inventive method, the first coating material is designed as an elastic polyurethane lacquer. Elastic polyurethane lacquers are characterized by high elasticity and resistance. They absorb mechanical stresses, thus preventing cracks or flaking of the coating. This advantageously increases the service life and resistance of the molded component. A further advantage is that the polyurethane lacquer forms a protective top layer that protects the finished molded component from moisture, chemical influences, UV radiation, and mechanical abrasion. This is particularly advantageous for sanitary bathtubs, which are used frequently in humid environments. An elastic polyurethane lacquer not only ensures functional protection but also allows for individual coloring of the molded component by adding appropriate color pigments.Various elastic polyurethane coatings are suitable for use in the process according to the invention, including, for example, 1K polyurethane coatings, 2K polyurethane coatings, water-based polyurethane coatings or solvent-based polyurethane coatings, without limiting the invention to these.

[0023] According to a further development of the inventive method, the second coating material is designed as a polyurethane soft coating material. Polyurethane soft coating materials are characterized by high elasticity and shock-absorbing properties. Advantageously, the polyurethane soft coating material, lying directly on the foam body, protects the molded component from mechanical stresses. The material also forms a soft, uniform, and grippy surface. Various types of polyurethane soft coating materials are suitable for use in the inventive method, including, for example, two-component polyurethane soft coatings (polyol and isocyanate), solvent-free polyurethane coatings, UV-resistant polyurethane soft coatings, or hot-sprayable polyurethane soft coatings, without limiting the invention to these.Advantageously, the material thickness of the polyurethane soft coating can be flexibly adjusted according to the requirements of the cast foam component in order to meet different load or insulation requirements.

[0024] According to a further development of the inventive method, the flowable foam material is designed as a two-component polyurethane liquid foam (2K-PU foam). Two-component polyurethane liquid foam advantageously enables simple and controllable processing. The foam material is processed in a liquid state, which allows for precise filling of the cavity even with complex geometries. After the chemical reaction and curing, the two-component polyurethane liquid foam forms a solid foam body with high dimensional stability and mechanical strength, thus proving particularly advantageous in the manufacture of sanitary bathtubs.Another advantage is that the properties of the foam material, especially regarding density, compression hardness and bulk density, can be varied by adjusting the mixing ratios of the two components, polyol and isocyanate, in order to meet the requirements of specific cast foam components.

[0025] A two-component polyurethane liquid foam (2K-PU foam) as defined in the present invention is a two-component polyurethane liquid foam consisting of two main chemical components: polyol (component 1), an alcohol-based substance serving as the base material, and isocyanate (component 2), which reacts chemically with the polyol in an exothermic reaction, producing gases that lead to foam formation. The two components are combined in a defined ratio in a mixing head or a special mixing device and mixed homogeneously. The reaction leads to the expansion and solidification of the foam material, which, immediately after mixing and during the open time of the mixture, spreads within the cavity while still liquid and hardens after foaming.Various types of two-component polyurethane liquid foams are suitable for use in the process according to the invention, including, for example, high-density PU foams, low-density PU foams, open-cell PU foams, or closed-cell PU foams, without, however, limiting the invention to these. In addition to the two-component polyurethane liquid foam described above, the following materials are alternatively encompassed by the present invention and can be used according to the invention: one-component polyurethane foam, epoxy resin-based foams, polyethylene foam, or phenolic resin foam.

[0026] In a further development, the sanitary tub according to the invention is designed as a bathtub, washbasin, shower tray, shower base, or whirlpool tub. Through the use of materials such as dimensionally stable casting foam and polyurethane coatings, the sanitary tub is significantly lighter than conventional tubs made of ceramic or metal. This advantageously simplifies transport, installation, and handling, especially for large tubs such as bathtubs or whirlpools. The method according to the invention advantageously allows for free design of the tub shape.

[0027] This allows for the realization of complex geometries, ergonomic designs, or special adaptations to individual customer requirements. This is particularly advantageous for modern bathroom designs or specialized applications in the medical or wellness sector. The combination of a lightweight core material and durable coatings ensures that the tubs are long-lasting and easy to clean, even with intensive use. A sanitary tub, as defined in the invention, is essentially a tub, tub-shaped or tub-like vessel, basin, or the like for use in a sanitary area, which, among other things, has an open, larger, deeper, and possibly elongated vessel, particularly for bathing, showering, or washing.A sanitary tub within the meaning of the invention therefore comprises in particular bathtubs, shower trays, whirlpools, foot baths, arm baths, sitz baths, medical and geriatric bathtubs, obstetric bathtubs, washbasins, etc. It also primarily includes permanently installed basins or tubs used in the kitchen area, for example as sinks or basins.

[0028] In a further development of the sanitary bathtub according to the invention, accessories, in particular inlet, outlet, or nozzle connections, can be molded into the sanitary bathtub during manufacturing. The direct molding of accessories advantageously enables precise positioning and a seamless connection with the bathtub material. This reduces the risk of leaks or fitting errors that can occur during subsequent installation. Molding the accessories in a single manufacturing step also reduces the time and costs associated with manufacturing and subsequent installation, and minimizes installation errors. By integrating accessories during manufacturing, the sanitary bathtub can advantageously be equipped with versatile functions that increase comfort and usability.In addition to inlet, outlet, and jet connections, other accessories can also be integrated into the bathtub, such as, but not limited to, overflows, sensor connections, particularly for controlling temperature, fill level, or water quality, preferably in whirlpools, heating elements for directly heating the water in the bathtub, LED lighting elements, massage jets, especially for water or air massage in whirlpools or wellness bathtubs, grab bars and fittings, speakers or sound modules, especially for integrating audio systems into wellness or luxury bathtubs. The seamless integration of accessories advantageously reduces the number of joints and transitions, which represent potential weak points for wear or leaks.

[0029] In an alternative embodiment of the sanitary bathtub according to the invention, the bathtub body features demoldable placeholders for the arrangement of accessories. Advantageously, these demoldable placeholders ensure that accessories such as connections or fittings can be inserted precisely and easily into the bathtub body during final assembly. The use of placeholders also facilitates the subsequent installation of accessories, as these can be retrofitted as needed or at the customer's request, even after the sanitary bathtub has been manufactured, without requiring extensive rework. Furthermore, the placeholders advantageously allow for a high degree of flexibility in equipping the sanitary bathtub with accessories, which can be individually adapted to different applications or user requirements.In addition to the aforementioned inlet, outlet, or nozzle connections, placeholders can be molded in for, for example, the following accessories (which are not limited to the invention) that can also be retrofitted: fitting holders for faucets or mixers, grab handles, soap or shampoo dispensers, sensor connections for, for example, level sensors, temperature sensors, or other control elements, speakers or audio connections, LED lighting installations, whirlpool systems (e.g., for air or water jets) and air connections, water filter or disinfection systems, or aromatherapy units. Advantageously, placeholders minimize the need for subsequent drilling or milling of the bathtub body and ensure that a consistently smooth surface of the sanitary bathtub is maintained when accessories are retrofitted.

[0030] The above embodiments and further developments can be combined with one another as appropriate. Further possible embodiments, further developments, and implementations of the invention also include combinations of features of the invention described previously or subsequently with regard to the exemplary embodiments, even if not explicitly mentioned. In particular, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the present invention. CONTENT OF THE DRAWING

[0031] The present invention will be explained in more detail below with reference to the exemplary embodiments shown in the schematic figures of the drawing. These figures show: Fig. 1 a perspective view of the forming device according to an embodiment of the invention in the open state; Fig. 2 a perspective view of the forming device according to an embodiment of the invention in the closed state; Fig. 3 a perspective view of a sanitary bathtub according to an embodiment of the invention; Fig. 4 a schematic cross-sectional view of a tub body of a sanitary tub according to an embodiment of the invention; and Fig. 5 a schematic flowchart of a method according to the invention for manufacturing the sanitary bathtub from Fig. 3 according to a further embodiment of the invention.

[0032] The accompanying figures are intended to provide a further understanding of the embodiments of the invention. They illustrate embodiments and, in conjunction with the description, serve to explain the principles and concepts of the invention. Other embodiments and many of the advantages mentioned will become apparent with reference to the drawings. The elements of the drawings are not necessarily shown to scale.

[0033] In the figures of the drawing, identical, functionally equivalent and similarly acting elements, features and components - unless otherwise stated - are each provided with the same reference symbols. DESCRIPTION OF EXAMPLES OF EXECUTION

[0034] Fig. Figure 1 shows a perspective view of a forming device 1 according to an embodiment of the invention in the open state. The forming device 1 serves to form a sanitary tub 2, for example a bathtub, shower tray or whirlpool tub, from a casting foam. The forming device 1 comprises several interconnected forming parts 3 which, in the closed state, form a negative mold 4 with a cavity 5 that defines the three-dimensional outer contour of the sanitary tub 2. The forming parts 3 shown have corresponding receptacles 6 for connecting elements 8, in particular pins or screws, to fix the forming parts 3 in the closed state of the forming device 1.Furthermore, corresponding, interlocking clamping devices 9 are provided on the outer surfaces 7 of the forming parts 3 facing away from the cavity 5, which enable additional stabilization and easy closing of the forming device 1. On the inner surfaces 10 of the forming parts 3, which in the closed state (cf. . Fig. 2) To define and limit the cavity 5 located inside 11 of the molding device 1 after closing, a residue-free release agent is first applied to facilitate the subsequent demolding of the sanitary tub 2. Next, the first coating material, preferably an elastic polyurethane lacquer, is applied, forming a flexible outer layer 18 of the sanitary tub 2. Following this, the second coating material, a soft polyurethane coating material, is applied, which has a shock-absorbing effect and forms an intermediate layer 19 between the outer layer 18 and the tub core 14. Both coating materials are applied using a hot spray process, which ensures uniform material distribution and optimal adhesion. After completion of the coating application, the molding parts 3 are pivoted or folded to close the molding device 1 (see Figure 1). Fig. 2) to transfer. Connecting means 8 inserted into the receptacles 6 of the molding parts 3 and clamping means 9 provided on the outer surfaces 7 of the molding parts 3 are used to connect the individual molding parts 3 to one another and to close the molding device 1. This completely forms the cavity 5 inside 11 of the molding device 1 and prepares it for receiving the flowable casting foam material, preferably a two-component polyurethane liquid foam, which forms the tub core 14 of the sanitary tub 2 to be manufactured.

[0035] Fig. Figure 2 shows a perspective view of the forming device 1 according to an embodiment of the invention in the closed state. The forming device 1 shown in the exemplary embodiment serves to form a sanitary tub 2, for example a bathtub, shower tray or whirlpool tub. The forming device 1 consists of several in Fig. 2 connected shaping parts 3, which in the closed state form a Fig. 2 form an invisible negative form 4 in a cavity 5, which defines the three-dimensional contour of the sanitary bathtub 2 to be manufactured.

[0036] After closing the molding device 1, the cavity 5 is filled with a flowable, two-component polyurethane liquid foam. The flowable foam material is introduced into the cavity 5 via the filling opening 15 provided on the top of the molding device 1 and distributes itself evenly within the cavity. Venting channels (not shown), integrated into the molding parts 3, allow the controlled escape of trapped air, resulting in a homogeneous and dimensionally stable foam body as the tub core 14. Immediately after filling, the filling opening 15 is closed with a separate molding part 16 to completely seal the cavity 5. After the so-called open time has elapsed, the foaming process begins, during which the foam material expands and completely fills the cavity 5. After the foam material has hardened, the molding device 1 is opened to demold the finished sanitary tub 2.

[0037] Fig. Figure 3 shows a perspective view of a sanitary bathtub 2 according to an embodiment of the invention. The sanitary bathtub 2 shown is the result of the manufacturing process according to the invention and has a multi-layered structure that offers both functional and aesthetic advantages. The surface 17 of the sanitary bathtub 2 is defined by a smooth and resistant outer layer 18, which is formed from an elastic polyurethane lacquer. This outer layer 18 forms the protective and flexible surface 17 of the sanitary bathtub 2. Fig. 3. Not visible, an intermediate layer 19 is arranged under the outer layer 18 of the sanitary tub 2, which is formed from a polyurethane soft coating material and rests directly on the tub core 14.

[0038] The tub core 14 of the sanitary tub 2, which in the exemplary embodiment is covered by layers 18, 19 and therefore not visible, is made of a dimensionally stable cured two-component polyurethane liquid foam, which was formed after the formation of layers 18, 19 in the open molding device 1 by casting the closed molding device 1 with a two-component polyurethane liquid foam.

[0039] Fig. Figure 4 shows a schematic cross-sectional view of a tub body 20 of a sanitary bathtub 2 according to an embodiment of the invention. The tub body 20 has a multi-layered structure and is shown in the Fig. 1 and Fig. The forming device 1 shown in Figure 2 is manufactured using the previously described method. The assembly process proceeds from the outside, i.e., from the outer layer 18 inwards, i.e., towards the foamed tub core 14. First, the outer layer 18 is formed on the forming parts 3 by applying an elastic polyurethane coating, for example, using a hot spraying process. After the outer layer 18 has cured, a second intermediate layer 19, made of a polyurethane soft coating material, is applied directly to it, also for example, using a hot spraying process. After both layers 18 and 19 have completely cured, they form a shell or outer casing lining the cavity 5 in the closed forming device 1. This shell or outer casing is then filled with a flowable two-component polyurethane liquid foam (2K PU foam) to form the tub core 14 after foaming and curing.For coloring the sanitary bathtub 2, the polyurethane lacquer can be supplemented with color pigments.

[0040] Fig. Figure 5 shows a schematic flowchart of a method according to the invention for manufacturing the sanitary bathtub 2 from Fig.3 according to an embodiment of the invention. In the method, in a first step M1, an open forming device 1, formed from several forming parts 3 defining a cavity 5, is provided, wherein the forming parts 3 are in an unconnected state. In the subsequent step M2, a release agent is applied to the inner surfaces 10 of the forming parts 3 that bound the cavity 5. Then, in step M3, a polyurethane lacquer is applied as a first coating material to the inner surfaces 10 of the forming parts 3, where it cures as the outer layer 18 of the finished sanitary tub 2. In the subsequent step M4, a polyurethane soft coating material is applied as a second coating material directly onto the cured first coating material. The second coating material is applied in such a way that it completely covers the first coating material.After the second coating material has cured, the molding device 1 is closed in step M5 by pivoting or folding the molding parts 3, thereby forming the cavity 5 inside 11 of the molding device 1. In the subsequent step M6, the cavity 5 is filled with a flowable two-component polyurethane liquid foam (2K-PU foam) to form the tub core 14. After this has cured, the completed sanitary tub 2, formed as a cast foam component, is demolded in step M7 after opening the molding device 1.

[0041] Although the present invention has been fully described above with reference to preferred embodiments, it is not limited thereto, but can be modified in many ways. Reference symbol list 1 forming device 2 sanitary bathtubs 3. Shaping part 4 negative form 5-cavity 6 recording 7 Outside 8 Fasteners 9 Clamping devices 10 interior surface 11 Interior 14 tub core 15 Filling opening 16 separate shaping part 17 Surface 18 outer layer 19 Intermediate shift 20 bathtub bodies M1 - M7 process steps

Claims

Forming device (1) for producing a sanitary tub (2) designed as a three-dimensionally shaped cast foam component, with a cavity (5) forming a negative mold (4) of the sanitary tub (2), comprising a plurality of forming parts (3) that can be connected to each other for closing the forming device (1) and that form the cavity (5) in a connected state. Forming device according to claim 1, characterized in that the forming parts (3) are pivotably or foldably connected to each other in an open state of the forming device (1) via hinges provided in particular on adjacent outer edges. Forming device according to one of the preceding claims, characterized in that the forming parts (3) have corresponding receptacles (6) for connecting means (8) which can be arranged in the connected state, in particular pins or screws. Forming device according to one of the preceding claims, characterized in that the forming parts (3) have corresponding plugging, locking or clamping means (9) on outer sides (7) facing away from the cavity (5), interlocking in the connected state. Forming device according to one of the preceding claims, characterized in that the cavity (5) has a filling opening (15) which is open in the connected state of the forming parts (3) and which can be closed by a separate forming part (16). Forming device according to one of the preceding claims, characterized in that vent channels of the cavity (5) are formed into the forming parts (3). Forming device according to one of the preceding claims, characterized in that at least one accessory part of the finished sanitary tub (2) and / or at least one placeholder for an accessory part that can be subsequently installed in the finished sanitary tub (2) can be inserted in the forming parts (3). A method for producing a sanitary bathtub (2) designed as a cast foam component in a molding device (1) according to any one of claims 1 to 6, comprising the steps of: providing the molding parts (3) in an unconnected state; applying a release agent to the inner surfaces (10) of the molding parts (3) that define the cavity (5); applying a first coating agent to the inner surfaces (10) and curing the first coating agent; applying a second coating agent, superimposed on the first, to the inner surfaces (10) and curing the second coating agent; closing the molding device (1) by pivoting or folding the molding parts (3) to form the cavity (5); filling the cavity (5) with a flowable cast foam; and demolding the sanitary bathtub (2) after the cast foam has cured. Method according to claim 8, characterized in that after the step of closing the forming device (1) the forming parts (3) are fixed by inserting the connecting means (8) and / or closing the interlocking plugging, locking or clamping means (9). Method according to one of the preceding method-related claims, characterized in that after forming the cavity (5), a further coating of the joints of the forming parts (3) within the cavity (5) with the first and / or second coating material is provided. Method according to one of the preceding method-related claims, characterized in that after filling the cavity (5) with a flowable casting foam, the filling opening (15) of the cavity (5) is closed with the separate forming part (16). Method according to one of the preceding method-related claims, characterized in that the application of the first and / or second coating material is carried out in a hot spraying process. Method according to one of the preceding method-related claims, characterized in that the first coating material is designed as an elastic polyurethane lacquer. Method according to one of the preceding method-related claims, characterized in that the second coating material is designed as a polyurethane soft coating material. Method according to one of the preceding method-related claims, characterized in that the flowable casting foam is designed as a two-component polyurethane liquid foam. Sanitary bathtub (2) manufactured by a method according to one of claims 8 to 15, with a bathtub body (20), wherein the bathtub body (20) has a multi-layered structure comprising an inner bathtub core (14) formed from a hardened casting foam, an intermediate layer (19) enclosing the bathtub core (14), in particular formed from a polyurethane soft coating material, and a second outer layer (18) applied to the intermediate layer (19), in particular formed from an elastic polyurethane lacquer. Sanitary tub according to claim 16, characterized in that the sanitary tub (2) is designed as a bathtub, washbasin, shower tray, shower base or whirlpool tub. Sanitary tub according to claim 16 or 17, characterized in that accessories, in particular inlet, outlet or nozzle connections, can be molded into the sanitary tub (2) during manufacture. Sanitary bathtub according to one of claims 16 to 18, characterized in that the tub body (20) has demoldable placeholders for the arrangement of accessories.

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